Update vpython version.

Update the "vpython" CIPD version to pick up schema and runtime
performance changes.

BUG=None
TEST=None
R=iannucci@chromium.org

Change-Id: If0e3c393abb16b8918b5fa16593a8788ef8947ec
Reviewed-on: https://chromium-review.googlesource.com/527608Reviewed-by: Ryan Tseng <hinoka@chromium.org>
Commit-Queue: Daniel Jacques <dnj@chromium.org>

cipd_manifest.txt

@@ -3,7 +3,7 @@
 # found in the LICENSE file.
 
 # vpython.
-infra/tools/luci/vpython/${platform}  git_revision:c6dbc470acfd836494db899bc6aebe0f3d2df593
+infra/tools/luci/vpython/${platform}  git_revision:cea2b0eb174d6d8e6b628020e3986cb251ea2d97
 
 # LUCI editor
 infra/tools/luci/led/${platform}  git_revision:712c596d2a593eb976d2bd202aee3e580990d3f5